removed unused use statements

src/main.rs

@@ -1,8 +1,4 @@
-use std::{
-    env, fs, io,
-    path::{Path, PathBuf},
-    process,
-};
+use std::{env, path::Path, process};
 
 use crate::structs::{Library, Shelf};
 use crate::utils::save_library;